Tongs for removing and putting in place the key rings of typewriting machines and the like



Apnl 14, 1936. o. FISCHER 2,037,223

TONGS FOR REMOVING AND PUTTING IN PLACE THE-KEY RINGS OF TYPEWRITING MACHINES AND THE LIKE Filed Nov. '7, 1954 mgl@ Vento/r Patented Apr. 14, 1936 TONGS FOR EEMOVING AND PUTTING IN PLACE THE KEY RINGS Oli"l TYPEWRITING MACHINES AND YTHE f Otto Fischer, Berlin, Germany, assignor to Wil-V helm Dreusicke &

many

Co. G. m.l b. H., Berlin, Ger- Application November 7, 1934, Serial No. '751,906 I i In Germany October 4, 1933 8 Claims.

The invention relates to tongs for removing and putting on the key rings of typewriting machines or the like with two pressure rams, the one for the pulling off and' the other for the putting on, both controlled from the handle of the tongs, said rams cooperating with grippers arranged in a circle and serving as a counterbearing for the key ring or the key.

In the tongs of this type of known construction one single control element adapted to be operated from the handle is employed 'for the two pressure rams. At every change of service a constructional alteration of the tongs must therefore be eiected, this being evidently tedious and requires time.

This inconvenience is avoided according to the invention in that the two pressure rams arranged together with the tongs have each a separate control element,l said control elements being adapted to be operated selectively from the same handle of thev tongs. In this manner it is 'attained that one and the same tool may be used without any constructional alteration for pulling oi as well as for putting on the key rings, so

that the operation is considerably simplified and Fig. 2 is a side elevation ofthe tongs, the case being shown in section.

Fig. 3 shows a key with key ring partly broken away.

Fig. 4 is a section on line A-B of Fig. 2.

Fig. 5 shows a longitudinal section through the tongs casing turned 90 relative to Fig. 2.

Fig. 6 is a similar view of the tongs as illustrated in Fig. 2, the pulling off ram being depressed.

Fig. 7 shows in a similar manner to Fig. 6 the tongs with depressed putting on ram.

Fig. 8 is' a section on line C-D of Fig. 6.

Fig. 9 is a section on line E--F of Fig. 7.

The tongs consists of the tongs head K and the tongs handle L.

The tongs head K comprises a side wall I, a

bottom 2 and a lid 3. These parts are connected the one with the other by screws. The side Wall I has a slit 4 through which projects a supporting bar E fixed on the wall I by little screws 5. A tube I extends through the supporting bar 9 and carries at its lower end a pressure ram A rod 9 extends through the tube l and carries a` ram I0 at its lower end. The rod 9 is screwed into the ram I. A spiral spring II is wound around the rod 9, one end of the spring being xed to the rod and the other endl by means of the screw I2 on the supporting bar 6. 'I'his spring maintains the ram I0 andthe ram 8 bearing against the same in the position ready for operation shown in Fig. 2. In this position the head of the ram engages in a recess I3 of the ram 8, whereas the ram 8 engages in a recess M of the bottom plate 2. A ring I6 is securely held by a disc i5 on the bottom plate 2 and serves as pivot axle for grippers I'I arranged in a circle around the ,L

rams', Ill,V The grippers Il have claws It and I9, those at I8 being longer than the claws lf3. The other end of the gripper Il bears against a conical driving element 29 shifta-bly mounted on the tube '!.A The grippers: I'I are heldin the spread position by springs 54. Rods 2l are xed in the conical driving element and bear against the lid 3 in the upper extreme position ofthe driving element. Spiral springs 22 wound around rods 2|v bear against a pressure plate 23 which is :i

freely movable'.

The tongs handle L consists oi two levers 2d, 25 oscillatable around a common axle 2E. .A bar 28 is pivotally mounted at 2l' on the lever 2t and securely held between pins 29, 39 of the lever One end of the spring 3l is attached to the pin 3U, the other end of kthis spring bearing against a pin 32 of the bar 28. This spiral spring 3i maintains the levers 24, 25 in the spread position; the bar 28 has an aperture 33 which in the one position of operation of the tongs handle L is lying above' the rod 9 (Fig. 7).

A bar 34 is pivotally mounted at on the lever 25 of the handle L. This bar 32 carries two bolts 36, 3'I which project through a guide slot 38 in the bar 5. The bar 34 is maintained in its position by pins 39, 49 of the lever 2S. On the bar 34 a pin 4I is` fixed designed to limit the spreading width of the handle L. In the position shown in Fig. 2 the tongs is in the operative position. If the key ring 42 shown in Fig. 3 has to be pressed on to the key 43 the key ring is rst placed on the key, whereupon the tongs are placed on the ring 42 so that the claws I9 of the gripper II are under the key 43. After Qii the tube 1. If the pressing together of the levers 24, 25 continues, the tube 'I and the ram 8 are moved downwards in opposition to the pulling force of spring Il, the ram I0 being driven at the same time. During the downward movement of the bar 28 the springs 22 and with the same the conical element 28 are driven. The conical element 2(1 slides on the tube 1 so that the upper ends of the grippers l1 slide upwards on the conical surface of the `driving element 20, the lower ends of the grippers moving consequently in inward direction and gripping the key 43. The claws I9 serve then as counter bearing for the key 43 so that by means of thev ram 8 suiiicient pressure can be exerted upon the key ring 42 to press the same on to the key 43.

If the levers 24, 25 are released, the bar 28 moves upwards into the position shown in Fig. 2

under the influence of the spring 3l, the springs' 22 expanding so that the grippers Il are again relieved of pressure. The rams 8 and Il) return into their operative position under the action of the spring Il.

If the key ring 42 has to be removed from the key 43, the tongs handle L is rst brought from its position shown in Fig. 7 into the position shown in Fig. 2. The levers 24, 25 are then pressed together so that the bar 28 bears at once on to the rod 9 and the ram I0 fixed on the lower end of this rod is moved downwards. During this `period the conical driving element 20 descends again so that the grippers I1 are oscillated in inward direction. The short claws I8 then grip under the lower edge of the key ring 42 (Fig. 9), whereas, when the pressing together of the levers 24, 25 continues, the ram I0 comes to bear upon the key 43. If the levers 24, 25 are still further pressed together, the ring 42 is pulled oi the key 43. After the levers 24, 25 have been liberated, all elements return into the operative position in a similar manner as above described.

I claimt- 1. Tongs for removing and putting on key rings of typewriting machines and the like, comprising in combination two pivotally connected levers forming the tongs handles, a tongs head composed lof a side wall having a longitudinal slot at its upper en-d and a bottom plate having a central hole and a plurality of apertures distributed about its periphery, means extending through said slot and connecting said head with one of said levers, inner and outer telescopically related rams accommodated in said head and projecting from the bottom'plate thereof, means on the other of said levers extending through the slot in said head for mutually shifting said pressure rams relatively to each other and to said head, grippers pivotally mounted on said bottom plate one in each of the peripheral apertures thereof, and a conical member xed on said outer ram and adapted to bear against the inner ends of said grippers and approach the outer ends thereof during the downward movement of said pressure rams out of said casing.

2. Ton-gs as specied in claim 1, comprising in combination with tire inner and outer telescopically related pressure rams, a spring acting on said rams tending to return said rams int-o their initial position ready for use.

l 3. Tongs as specified in claim 1, comprising in combination with the tongs head and the inner and outer telescopically related pressure rams, a

shoulder on said outer ram serving as abutment for said inner ram, and a spring connecting said inner ram to said tongs head.

4. In tongs as speciiied in claim 1 the means connecting said head with one ofthe levers, comprising two bars mutually shiftable in longitudinal direction,one of said bars rigidly connected to the inner Vside of the side wall of said head and having a hole adapted to guide the outer ram, and the other bar pivotally connected to the lever Vand having' a slot surrounding said rams to allow said last mentioned bar to shift radially relatively to said rams.

5. Tongs as specified in claim 1, in which the grippers are 4arranged in a circle about said rams and provided with two sets of claws, one set adapted to engage under the key rings to pull off the key rings from lthe keys, and the other set adapted to serve asrsupport for the key when tting the key ring. 5

6. Tongs. as specified in claim 1, in which the outer ram comprises a tube extending through the central aperture in the bottom plate of the tongs head and a pressure head on the outer side of the bottom plate of the tongs head, the inner ram comprises a rod extending through said tube and carrying a pressure head at its llower end, and the meansI for shifting said rams comprises a bar pivotally mounted on one of the levers adapted, when said levers are approached, to first bear against the end of said rod to shift said inner ram relatively to said outer ram and then bear against the upper end of said tube to shift said outer ram relative to the tongs head, said bar having an aperture to receive the upper end of sai-d rod towards the end of the approaching movement of said levers.

'7. Tongs as specified in claim 1, in which springs Yare mounted in the bottom plate of the tongs head and tend to maintain the grippers inY inoperative position ready for use.

8. Tongs as specified in claim 1, comprising in combination with the tongs head, the pivotally connected handle levers, the conical element, and the ramV operating means, two parallel rods extending' from the upper side of said conical mem 

